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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0599697584b8c3fe5319af31adce1bbdb8c95a9c7df5a519cf834662707bc1ce' 
  AND token = 'avxH51jS9plEFmV9Rm6khK+Y+dtjhH9raI0++hnkNLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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