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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f7289dabe69a67d07f8fa0759f6c0ea9d0842e3bd38b68935b6d859ea819f1' 
  AND token = '3gM0iSCjb9yrSLyv3h1pTDBgKC/QXPLQM0zAUbIsqMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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