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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d8b96a6930ac4a4ff4009fd2a5c77101094712ff3bcf8f66bc71e13a85ec1d' 
  AND token = 'cm+6o5MJlRq7s3XlLwf0VEyQVwu+/35UIFfv5FZxsZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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