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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010026c1b4e2de54334c38cf34152683ae497850d56741f7d17a52c82a16569a' 
  AND token = 'u7OCSBT9Yfos2U+QcrXtKOY+MR699P272hzRjS2M12k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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