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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1c0f1fdd2390e42e4a0e4fb8fa30ba915ee50ff8a4ed07725e4ee0a5786ebd' 
  AND token = 'gO/8vQAqtq+u0zeArO5fx1Y+qKtkgiJZlzHN2dGoUzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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