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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c9e21b4bbd0b3e2888976286ed49f45ceae9e3679ca0b78c88d86372f0728e' 
  AND token = 'BUOx0d4kbSCvGv3k7JfLr7zR0Jm6i0304rVppTr0W+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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