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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd38f922c3a9efadde64ecd4246ee39eeda1cda4cf816c8d2019e4d1c46d510' 
  AND token = 'Mdp0APTgu4IUStioMdOfW1dsDQiSxN8AI4pxbbzS5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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