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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e59eeca6eecd30f5877454a1a2e1e981a2d3df79fd46668291a7f1a80871bc' 
  AND token = 'YgWRsQEsqoB1w8An5kPE36l4g4E1ncUKY2kb4UhSlmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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