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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96697f27abd8c029c0ce8766e93789911b41ca2a79fe3903b5d446ed4ac02efc' 
  AND token = 'z5P3nCiZTOs+64ulcQoQ99c8LYl8pYlhxdI/CpeX6r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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