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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364926b5f1116a4ebe7f9f06c4f9807822c70f3aadf6863f20a1479e309c6d12' 
  AND token = 'C3UmFeeKHfSWNL1HscuPCgM3+UxD0/SoSeVl/YDPk1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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