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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71d1654166eadf02bf0b60f5790bcfd62b39a649082d4b6ee6f286967b54694' 
  AND token = '+RsoYhWAZ9cNaHqdwljDoIM04iEWLFNJLhIwNXGzmx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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