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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d6db62fc4bdd3a41b95665f1581fec3c1b5c1ddfb0f3341d27700f924441a6' 
  AND token = 'mrzO+mytG2GY/5IqPfTUGJsV2Xdy7F2OYAEXiZ/AAQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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