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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da46f7e4ce02350ffb76bf9409c985d646c27b43141ee65cf3f7bf6ca9aa52f' 
  AND token = '9T8pmQz5OopzGfozGgLqq3hLT4TiscxS8Ukge0qN0Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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