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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2459727b5a810d59ead9977edb98c8dca576be9edf2550bb560d7e95d19c88e' 
  AND token = '+cGwft8HZX/YXk0Qg8F9mPBYTni2LzY+RfgpcJx+Zfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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