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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bb7cbfce1e9c98ad9961c823981f0ac1ea8208c08f1dc2fa3c0a08a32dd1ac' 
  AND token = '6IzmaRZkODkTr+/7E4iTszV0HdFw/+ogwcZK4ykP4eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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