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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10a470e544fa0d754689fbbc8e4b63def40f907ceef80c0b67acee3fdf8dd85' 
  AND token = 'LTepBkVkXwY9Rz6YJlcOhE2E8v8o1BrIXQWxY5m7WVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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