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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f68139493c6b887ebc473673e78f44f51605ed838a9f5567e4f519b06db461' 
  AND token = 'lGixQtrYBY7U+fE0d07CZ0N2myunJaDMhAT+KipG7pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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