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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3a8574ca074cab93b354c42b3c5b544198781c93f37d9488bedd3394aa0705' 
  AND token = 'Zz5S/XO6yvvmt3v9MdtrsygbChKgpb66a6lGjaFJwzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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