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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdc677d5a2252bfbb5ff4cbecc65f4f5adfba30826f7c40b7befde6b9a3dc23' 
  AND token = 'yjHOErjkuG3xHJlyu/EllrVOGhxc42rXpZs/iUFyBy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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