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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f4ade11778614ba0444731e774b1bda1c82b42d578953a73571ce29a16e7e9' 
  AND token = 'q6t2Mo4RIw3xKOdCU3MOnXsTNg5qrwkbfMoC9IiVlPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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