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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558db96c37317eb46f1204c15b670185cfa9df47638b3b71e9d1f07e6a5cd77d' 
  AND token = '8Y3jrHzv9u59aB2+rbkoZyWZOlrFpmCIWlm47wmEUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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