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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2903c63d65f75f5aeb9a44abae5f1b8312f058c9f591eebb6ea84f59fa0bf242' 
  AND token = 'b4FVbhKK0oKAGv5O1/nekwyKaPJK+PCEdawFzuc3QVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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