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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7651eb26ad5d0783cd2364cd44e873c4895d332161a3d6368871d96e97cdaa' 
  AND token = '5yTxZ62nsZusOGlpu/YDu3ZoLqY3EfJ85dXm1KbI9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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