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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76627d9d78f66e0af818470a770bebe42bb3022af20ca8d2d84f837cd397c5db' 
  AND token = 'QP5lqaaYgIN6W4sr+rsKdIHjjkpsMAhCyOzlpX5aHa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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