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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445dac04d669afe0d462d14207c8d2ed118f850c0970efb1124d8b58c81ce32b' 
  AND token = 'cn3lL9y86G9pWdwD2w4/q8FGczuyh5uuglKSzDKOrfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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