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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a902637fbe2b3b821d931760a5ac57a8eceba9909f1186cb573f23326be5f86f' 
  AND token = 'DMenMIdTULyWct8+TEh+7e/cFCbUhao/2tlYXYwUNUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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