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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48964eaef4345034eafe7720b21897967eb15c1191dd79d8219ce83f4b35057' 
  AND token = 'qXUW4oniyNevdrgHTXvA9SZJ1X10HecYXq42BP9IYmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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