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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89f44f358fbaaed7f2566097da7790b55dbfbedf1c2624ea5fb59a3f7f9c842' 
  AND token = 'etZm9uqKw0Z7g7VQy9TuVG0qKCnFPTM8rmaNSS2Oi8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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