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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb94ac4db35a9321c0f7291ca5b7f2e4182bc53bfc59df3a1c7319ede1943f83' 
  AND token = 'eWjgT3W7zGNl7mLBtgNLqGzjXvwcIi5aztHA2jjhPx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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