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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740619dc7ce8ceb8b336ed67149c12648c3825fbc3c54b80cc1da76e8e9a1fdf' 
  AND token = 'RakF+4PpiMDAo0S+JzPXaYMVURslpQK6EWub2EJWI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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