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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6fd01ec7572da9e9a48fe1167aa77d3e9034ecf75cf016c0752d05c18b6e08' 
  AND token = 'CJ7nfNW20i7//vuyS9aCl0cS5wTR746VlJD8It28qWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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