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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a13c6b7c9cb1be35f0cecb66ed508666731b4657985c076132b7948c026d1f' 
  AND token = 'FyMrQbijFsGQ7wSXPUT7Zc9hqRJ1piZVNNkh7VhLQ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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