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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a36f34346088c07feb17304836524d6b97bf5e7754a90f65d03867eae4211cc' 
  AND token = 'FB5VvPKUNaA7JMlh3ijVw84kAX5QiWTweTGMe7i/erE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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