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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7086aeada8cb462370192259db0a3bf8b52985486eefa113c9f3d7a900eed9' 
  AND token = 'w9S89Z3NfbrBMBYtJd2Rml8o1a9cxyjufgX+b0ew90o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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