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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330ca8020705debfdc5df9e436585b6762079c4e950dd7ad2b91065b660e73d5' 
  AND token = '75/Vw2bUZYDQjp7WYf7UbLejinCnNeh9Opz/RsSJAkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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