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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424a070e0b6ebde016c8d5acac587a15bfa445ee3986ecf2c007bc5fa0743d76' 
  AND token = 'Q/ONPoRRZoIVL+COD5fL2wwigvhB1J9aCLgILUcuI3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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