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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0a4e773dc0562ada30b98e47ccc6bef9d3f9b84563914f53ca108fb1c7099b' 
  AND token = 'IlkTFzDWidxW+yxb0jcxeF3x6nGiKuXOJ1vlO18ofqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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