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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f1d404c63130c98a366d843b11c5bd211ea4c9e678135622206ccf92424b4' 
  AND token = 'dJQSTxWygrftTW0uggc/eyMAy7C0rS+WZeeKfk/iCio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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