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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da079d0c0098ba9d7fd0da6b399da3428c2a7e1926cab196e4ad2ca87a9f8c58' 
  AND token = '5S9rZoZzDdpYLt8VFxrnM1ppFw/wq+kuBkX/hL1Q4OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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