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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86822985c494b76a77bd83465fee6f438fbb2daf54b4985de8d5340475fffeef' 
  AND token = 'lbPoxlxfyalijLRAvrOsLF6NBeBGbF/Tqpgdv6xw8Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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