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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbeae317823f41d8407b24128c466d460dd088b7cf588cd49080b5b17b1c1cca' 
  AND token = '4ig+eXOsHyg3ekfreZt+jsZ+YvuSdFA5MmjcNjm1+fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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