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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cd7b0df9784322e172ddf6f368fb41b1e807f65255dd0e7197db2bf32d72ef' 
  AND token = 'SZe6KXQ0814BYO4S5wUQ1cxfu1o543CWMPP3LIUyLyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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