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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6719a58ea8a162d5534d90b3dd355a6dd0fb302e26a3f8beed4c8d6cef08e5ad' 
  AND token = 'DihQXvfk71GdCFR8hSrN7DJII7okEieLUjuoAubaDfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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