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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c782f36553787f1925886ab74a34ef7b8d28c95b859fb9448a01c9bf4c1e21' 
  AND token = 'UZZE4i7PpgNfDk37cWizVTTTdHNJIPVU2HXXF0WuPPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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