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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6475eccebb14a972991013e4e5f4fc6f68e6b85a2445fde2b96ccadca81fe41e' 
  AND token = 'g8Q6upVRmzjmIZ5hRD8atbBdeV3+x1g9M/FDrjEwAeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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