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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337bb9f20e159fc8e9b40ee24eef041a6161ba416041bdbe882280973a761131' 
  AND token = '7Si269HNE5NjNj4vKcButmq01QUEbDpZH0McWNENOo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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