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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62b830864ff81aed9b7be724da3c1646fb4647c340368924583ea29a3f7e7b7' 
  AND token = 'Fir53HZwoukz4SINmVpA53DqqkjLWvR6SqiD9zvyvvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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