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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908d245292a91e39fb456c37368bd428fc2f082455b4579355e7192d1b38f1e9' 
  AND token = 'c/sl7/WPbIRNJLcG3V0FTrc7h6szJDkvasErXc8zIcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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