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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c20447397fd580c708b39dbb8540fa6f4449fa804e5741cd0301f3c5d7ad4d8' 
  AND token = 'tBT58ruXCIM+YEx1REDblK4DuFoeSr7Z4s622KWc73E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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