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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e962f973bfb705351ec38bc37e221b2f8a677b0be57191877c60ec9a628f9755' 
  AND token = '2JmhBh8q8Yk7WhnukeQw/2JkrYqeaJhGMDtTUq+0oGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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