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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f71f7c0c4336ba3b4bb35e4eb0c0493cfb6755b9226c2b0e8eccfbc2c59065' 
  AND token = 'Td79jaEjqgGSeZLyk5JmYaw3OFe4UQSPUT2FsI5MYko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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