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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e342f718c4e0fc7e1e5e466f87bda143d90ccb5ba747e353008b7e41a9f4b6' 
  AND token = '/LLHr7yv6SHZeKZs2UkgifMzVJrecgvFVs895YZxmbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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