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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087da9a1714689b862eb11bbac9a0513f16d05f1c35306167c57cd3b78e09d11' 
  AND token = 'biy2cWVXGvqCFhHSo9wCAYEy75enfUprn2zbSQhlruU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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