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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb90398fb0463595b343cdf8dbd6132f2298414495669dfef597d973e659ee5a' 
  AND token = 'AGRb3koniPjs4yEgCQ4OVK26eoeqrpTJ5qoWWG2o6Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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