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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0097fef95863c67473d7d8867a35733beb33db44c4c16c80c1f485fd0851adf' 
  AND token = 'lG3k44KU0SzqsoWR0wOrxteTGTEH3HlKeLm7leK7czU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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