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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab1871685b541f6554336ef8652ac4e4585fef6c958e7f6ce191f24c32bbcc2' 
  AND token = 'BWPxYX9h1qVKYcIbR197xytspVaLaGAXrtp9GW+IqX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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