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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3777046ca33742f3750d6a7fe25a3f3ca45cc812745ebf659234033f7c37360b' 
  AND token = 'XBIbCDla9jaRf8mAXqlxQ2wRj9wSdxO+Dwtsex4Y/yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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