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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baee782114b1cbc853fc6bdd6028e6654189efb7a5d07db160177e1bf9240df' 
  AND token = 'qkPoAL6xaUF3sbKOfn8Yk68DBCqbl7MckRkHrSST3DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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