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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04acb769284c9bdf6e0d7289ecc41b098ccc52bcc80f45a6b63472202a255fd7' 
  AND token = 'V/YOW1hLeSIi4oqcg4TAnz4cC/Q1389oRFcPsd1avcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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