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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d31864af14d1db7368abe43b5611a1aa4038a8530660f48f6354944327a882' 
  AND token = 'P6v4Zl6IBa9T7fSZaFdruXkR/iWpwFc0M8hGr1PbdF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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