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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bca2ae35aaf800ae1e5ebabce1416f4324f1b440c9974a41174ae74ac1d03c' 
  AND token = 'OCp+6uEvNerQrp7HGDS8569YNov11miOVCSYkeW5yZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}