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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c64bd18d0638cc58abffa67ec0232e928ff554080b058c745137aa4fcbea8f8' 
  AND token = 'uDfK6yt3VcxJDD9nIxY0OQt341g6s5mWGMw0hKzkRUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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