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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c96cf3b8d73160a71cd977fcfa24bd1d7a3577bcdec147ac6f1e3330143eed2' 
  AND token = 'DRaRm9WIkzvOXNKlrv+/BI4iBIEix+/jLMSc/3YqcbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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