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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f704b078c223610e2cdda3dc95c4fb19709042e96d65698618b16f8ec3dd68c' 
  AND token = 'WrHzBboqmdZ9LEEQh+gXEU1ObMBSP0BhzkaJwp+oIG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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