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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabfc0ae38a79d772cc9d24c8fff3fbed84bae2b1add2461aa9ae8422b260aeb' 
  AND token = 'tPPjJEXhssZ+100endAoPPeXG07/mSYy8YTceCe9Nv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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