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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5864dfce34562393ef885fae72bad83b75eea00bb3ef0c7d92b3589fb6cae9' 
  AND token = '2WxUlRjBlEruLa9N9OzEkSIK7GOuPBVbhfkVLtEFKMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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